Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Charlie,
Are they on a metric grid and it is being converted to inches?
2.5mm rounds off to 0.098"
Bertho
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From: gandolfreefer Sent: Sunday, September 26, 2010 22:21

PS: one thing that puzzles me about eMachineShop that you or someone may be
able to shed light on...in their menu's, they keep trying to force grid
spacings on me like 0.098", etc....when I prefer to work with 0.1", 0.050",
0.025", etc. Why the odd numbers? Is it some sort of machining convention
worked out over the years to take into account normal tolerances (i.e. +/-
.001", etc.), or are these dimensions most easily convertible back and forth
between inches and metric????